Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756754Ab2KVTWH (ORCPT ); Thu, 22 Nov 2012 14:22:07 -0500 Received: from mail-wg0-f44.google.com ([74.125.82.44]:55147 "EHLO mail-wg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756734Ab2KVTWE (ORCPT ); Thu, 22 Nov 2012 14:22:04 -0500 MIME-Version: 1.0 In-Reply-To: References: <20121120180949.GG1408@quack.suse.cz> From: Linus Torvalds Date: Thu, 22 Nov 2012 09:21:43 -1000 X-Google-Sender-Auth: fbzQ30WS5R6JwiKxLduSX35_QR8 Message-ID: Subject: Re: Recent kernel "mount" slow To: Jeff Chua , Jens Axboe Cc: Jan Kara , lkml , linux-fsdevel Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1625 Lines: 39 Doesn't sound like a fsdevel issue since it seems to be independent of filesystems. More like some generic block layer thing. Adding Jens (and quoting the whole thing) Jens, any ideas? Most of your stuff came in after -rc2, which would fit with the fact that most of the slowdown seems to be after -rc2 according to Jeff. Jeff, more bisecting would be good, though. Linus On Thu, Nov 22, 2012 at 4:30 AM, Jeff Chua wrote: > On Wed, Nov 21, 2012 at 11:46 PM, Jeff Chua wrote: >> On Wed, Nov 21, 2012 at 2:09 AM, Jan Kara wrote: >>> I haven't heard about such problem so far. What filesystem are you using? >> >> I've tried ext2/ext3/ext4/reiserfs/btrfs ... all seems to be slower >> than before. Seems to be fs independent. >> >>> Can you quantify 'is slower'? Bisecting would be welcome of course. >> >> Haven't measure, but it seems to be 1 sec instead of .3 sec to mount. >> I'll start bisecting:( >> So, since I've 6 mounts on start up, now it takes 4 seconds longer to boot up. > > I started bisecting, and it seems to have multiple points of slowing > down. The latest kernel is really slow mounting /dev/sda1 (fs > independent) ... 0.529sec. Kernel 3.6.0 took 0.012sec, Kernel > 3.7.0-rc2 took 0.168sec. Again, these are very early results. I'm > verifying them again. > > > Jeff -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/